Term:A computer virus is a software computer program that can spread from computer to computer and multiply itself which in it could do many damaging things to your computer.
Dangers: It can delete many personal and important files or data stored on your computer. It spreads through the internet coming into a huge amount of computers. It can also disable your programs and majorly damage your computer.
How does it shows up: your data or files starts to dissapear.
Protection: you can install anti-virus software to eliminate known viruses